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You should book your internal Spain flights as early as possible. The cheapest seats go first.

You will only be able to book your train tickets after the summer schedules have been posted, which should be by the end of June. If you need to set your budget, you can check to see what the cost are now on the trains you want to take. There should be little or no price difference between then and now. You can check the prices at www.renfe.com and www.petrabax.com.